That's great news about Wayfair. They seem to have made a concerted effort to stay within the city. (A co-founder lives in the South End and can walk to work.) Admirable, and makes sense if they want to get nearby talent. (Although with a starting salary ~$600/week, many have to live outside the city, itself.)
One could make the argument that tax incentives, etc., should go to a company like Wayfair instead of a washashore like GE or Amazon, but I don't see it as an "either-or" especially since it appears Wayfair hasn't even asked for any handouts. Plus, it's a shadow of the size of those other two corporations.
I HATE giving private companies any of the city or state's money but felt GE and Amazon (if/when it happens) were exceptions to the rule. Too much upside. (Plus the amounts, at least for GE, were so minuscule.)
Regarding Wayfair, they used to lease space at 500 Boylston when they were in-between 177 Huntington and Copley Place so going back there wouldn't be unexpected. I fear they'll start sending jobs to the suburbs, at least some of the back-office, no matter how much we want them to stay, in the search for profit(s).
For some reason, I can't imagine them taking space in an under-construction building, they just seem like a different type of company than that. But .. put their name on the exterior, maybe they'll bite?